I've used Dick Sutphen Mind Travel tapes. Creates some interesting imagery but nothing really noteworthy came about for me, basically just as effective using self-hypnosis. Good for if you want an outline for learning self-hypnosis and probably keeps you more disciplined. I was quickly bored listening to them and actually found the sound effects annoying/distracting to my visualisation.
If you haven't done a course in self-hypnosis then you might enjoy the tapes because they do follow the procedure of inducing relaxation and then directing the mind to specific outcomes/goals.